Attachment-plug.



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ATTACHMENT PLUG.

ICATION FI ED AUG 30 APP |915- 1,224,987. v A r PatentedvMay 8,1917.

sfr AlEs PATENT oEEicE.

...fnoiaEs'olvl E. woLcoTT, 0E EAST cLEvELANn oHIo, Assienon To RALPH s.- MUELLEE,

, or CLEVELAND, 01110.I

ATTACHMENT-PLUG.

all (whom t .may concern.' Beit known that I, RoBEsoN B. WOL- x to portable translating devices, lamps,`

otors, heating devices, etc.

he-principal object of my invention is to de an attachmentplug which can be ily wired. I` am aware that avarious vrms ofattachment plugs have been pro- I ,fpd'sed'jand are in use, butin all those plugs i ith which I am familiargit is diiiicultl and v-lJt-lie attachment 'plugs now in use, Ithe vwires' are connected to thecterminals by screws', which, besides bein so small as to make -,their manipulation extremely .di-

.cultby wiremen whose. fingers are clumsy from 'performing heavy.. work, are liable to v become loosened in service, and permit the causing fusesto melt, or more serious troumiliar, -the `wiresfare soldered to metal *parts which, in turn, are electrically con nected to the .terminals of the plug. These 3 5'devices are expensive to -manuacture and arealso diiii'cult to wire. A

- Another object of 'my invention is to pro-'- v idean attachment -which canv bev easily lmanufactured at low cost,- the`r`e being but .four separate parts, allof which are extremely simple.

- .f jStill another object of my invention is to provide an attachment plug inv which the.

`wireconnections are made by lsoldering the befthe safest and-most eliicient. r

- attain these. and4 other objects, and avoid Speciication of Letters Patent. l

acitizen -of the United States, residerefore expensive to wire them. In some stranded wires to make short circuits, thus- 30" ble.. In other plugs vwith which I am fa? passed-through this yhole-fandsoldered .to

- form a 'substantial button which cannot be wires to their terminals, a form of' c 'onnec tionwh'ich -is conceded by'all electriclans to Patented May s, 1917.

Application led August 1915. Serial No. l18,067.

attachment plugs by the u'se of the device illustratedinv the accompanying drawings in Whichz Figure 1 is an end view and Fig. 2 is a longitudinal section of one form of my invention; Fig. 3 is an end view and Fig. 4 55 is a longitudinal section of a modified form of my invention; and Fig. 5 'is a side elevation of my invention. l

In the drawings, l represents an ordinary Edison 4lamp base, made up of the oval 60 threaded, vmetal shell, 2, which forms one terminal of the circuit, the center metallic ,"'contact disk, 3, and the insulation, 4, which Fis molded. about and rmly securesv the parts, 2 and 3,-together, so that, mechani- 65 cally speaking, they form a single member.

5 represents the main body of the attachment plug which is preferably made of insulating material whichl can be molded separately Pfroml the lamp base and afterward assembled therein. 6 and 7 arelthewires which are connected, respectively to the ter1ninals, 2 and 3, and conduct current 'where desired, f 6 and 7 are lshown twisted together -in the form .of the i ordinary stranded duplex conductor or lamp cord commonly used for such purpo-ses. The co tact disk, 3, hasfahole, 8, atAv its center.` Y ne of .the conductors, 7v s the 'diskfrom the outsideasfclearly shown inl the drawing.v When the Vconductor 'is stranded, the strandsjmay be spread 'apart' outside vof the hole, and, when-soldered, Y

pulled through the hole, 8. L

Them/ain body, 5, of the plug is threaded 'at 9. toreceive the metal shell, 2.- At the outer efnd of. thet)iody, 5, there is an enlarged portion," the 'outer surface pif/eh which' may be knurled or fluted to lfacilitate manipulation when the device is beingvv screwed into or out of a lamp socket 4or other'v receptacle. f

Ajhole', v11, extends-longitudinally through 95 the body, f5, for the reception of the con-- ductors leading to the' terminals 'of the plug;

Inthel .form of attachment plug shown der, 14, of the enlargement, v10.

before soldering, and to form a lock or key leo to prevent the subsequent unscrewing of the shell from the body, 5. The opposite side of the shell may be indented at 16a into the vacant slot, 13, on thatside, to form an additional lock against such unscrewing.

In the form of attachment plug shown in Figs. 3 and 4vthere is a central longitudinal hole, 17, which extends through thelbody, 18. Instead of making hole, 17, of uniform size, I prefer to form" a shoulder, 19, and contract the diameter of the hole beyond this shoulder as shown at 17a. In this form the slot,'12, is no-t shown, although it could be made in the end of the body without detriment and thereby enable the plug to be wired either as shown in Fig. 2, or as shown in Fig.` 4. On opposite sides of hole 17 and cutting'partly into the shoulder, 19, partlyv through the Wall of the hole, `17, are holes 20, extending obliquely through the mate-'- rialoftlnbody, 18, and connecting with slots, 21, which are similarlylocated to slots, 13, of Fig. 2.

The conductor to be connected to the shell, 2, may be passed through either of slots,20, and soldered as at 22, the shell, 2, being indented at 22 and 22aL similar tothe indentations at 16, 16i of F ig. 2.

. I tjwill be understood that the indentations',16, 16a or 22, 22a, are not to be made until"\the wires have been placed and the shell, 2, has been screwed on to the body of the plug. To wire the plug the shell is separated from the body, the wires are passed through the body and the insulation is removedfrom-the wires for a short distance back from the ends. The ends of the wiresl are then bent into the approximate positions they are to occupy when connected to the plug and the base, 1, is screwed in place. The center conductor, 7, readily passes through the hole, 8, on ac.- count of the funnel shaped or counter-sunk opening, 23, in the insulation, 4, while'the conductor which is to be connected tothe vshell is pressed into the slot, 13, or 21, and'- retained there by theshell as the latter is screwed on to the body of the plug. After l y the base, 1, is in place the shell, 2, is inl dented as described and the ends of the fconductor vare soldered to their. {respective terminals. ItA will bev observed-'that when the shell is bent into the groove, it not only locks the base in the shell against independent turning, but also tends to clamp the end Y of the conductor wire in the groove so that when the solder is applied a very eflicient electrical connection is made.

My preferred form of attachment plug is shown in section in Fig. 2. In this form, it is to be noted that one of the conductor wires passes clear through the central longitudinal hole, 11, ,of the body portion, 5,

is bent outward over the end of the body, backward through the longitudinal slot, 13,

and again outward in the radialA slot, 15, where it is soldered to theinner endof the threaded shell, 2. This bending of one of the conductors over the end of the body materially adds to the ability of the conductors to withstand excessive pulls upon them without becoming detached from the attachment plug terminals. That conduc- -tor which is connected to the metal shell in the manner described, will resist such pulls and protect the other conductor from exl cessive pulls.

Other modes of applying the of my invention may be'employed without departing from its scope.

I claim as my invention :n

1. An attachment plug for electric circuits comprising a cylindrical metal shell having internal and external threads l principlesv formed thereon, a metal contact disk at one end of said shell insulated therefrom and secured thereto, said disk having an apernture therethrough adapted to receive a con-v ductor wire,'a cylindrical body-of insulat- 'ing material threaded externally to lit the ica internal` thread of said shell and having a central longitudinal hole therethrough and an external longitudinal groove along one side, said groove being covered by "said shell, said longitudinal hole being adapted to receive the two conductor wires which.

are attached to the plug, one of which wires enters said hole, extends through said body, passes through said aperture in said `disk and is electrically connected thereto, and thev other of which wires enters said hole,

extends first through said body, then radinal slot` in said shank extending from the endof said shank to said shoulder and a.

transverse slot insaid shank intersecting 'said longitudinal slot and extending outward therefrom, said -slots being adapted to receive a conductor wire, of a metal shell provided with internal and external threads, a metal contact disk, insulating ymaterial electrically separating and mechanically joining said disk to one end of said shell in 'axial alinement therewith, said disk and said insulating material each having a central longitudinal hole through it adapted to receive a conductor wire, said A shell and said disk constituting the electric terminals ofk the attachment plug and being adapted to make contact with the terminals of an incandescent electric lamp socket, said shell being adapted to be screwed onto said shank. v 1' 3. In an attachment plug for electric conductors, the combination with' a body of non-conducting material having an externally threaded shank," an enlarged portion forming a transverse shoulder on said shank, a central longitudinal hole extending through' said body adapted to receive two conductor wires', an external longitudinal slot in said shank .extending Yfrom the end of said shank to said shoulder and a transverse slot in said shankintersecting said longitudinal slot and extending outward therefrom, said slots being adapted to receive a conductor wire, ofa metal'shell provided fwith internal and external threads,

electrically separating and mechanically axial alinement therewith, said disk and said insulating material each having `a central longitudinal hole through it adapted to r'eceive a conductor wire, said shell and said disk constitutingthe electric terminals of the attachment plug, and being adapted to make contact with the terminals of an incandescent electric lamp socket, said shellV ,the other extending from said longitudinal being adapted to be screwed onto said shank, and two. conductor wires, one of them being passed through said central longitudinal holes in said body, said insulating material and said disk and soldered to said disk, and the other being passed through said central longitudinal hole in said body, bent outward over the end of said shank andbackward -through said slots beneath said shell and :adapted tobe'screwed into the metal shell ci an Edison incandescent' electric lamp base, an yenlarged portion forming means for manipulating saidattachment. plug and forming av transverse shoulder to limit the distance said shank may enter said shell, a central longitudinal holeA extending through said bodyfor the reception ofthe wires connected to the attachment plug and an external longitudinal slot extending from end to end of said threaded shank, terminating at said shoulder, adapted to receive that one of said wires' which is to be connected to said shell.-i y

5. An attachment plug comprising an 1n- `sulating body having a threaded shank; a

shell screwed onto the shank; a contact member insulated from the shell, said shank having an inner longitudinal passageway extending therethrough and an external groove which at its outer end leads into or communicates withssaid longitudinal passageway.

6. In combination, an attachment plug comprising aninsulating body having a shank provided with a longitudinal passageway extending therethrough and provided with anv external groove; a contact member engaging the outer surface of the shank and Icovering said groove; a second contact member insulated from' the first named and located adjacent the outer end o f the passageway; and two conductors both extending through said passageway toward the outerendof the plug, and one extending from the longitudinal passageway to and then back along said external groove andelectrically connected to said first named contact member, and the other electrically connected to said second named contact member.

7. .In combination, a plug comprising an insulating. body having a shank provided with a longitudinal passageway and`with a 'transverse slot or groove at its outer end a' :shell surrounding said shank; a substantially centrally disposed contact member n'earthe outer end of said longitudinal passageway and insulated from the shell;

andtwo conductors, both extending through said longitudinal. passageway, one electri cally connected tothe contact member and passageway through the transverse groove and electrically connected to the shell.,

8. An attachment plug for electric circuits i comprising a cylindrical -metal shell having internal and external threads formed there- 'and a--transverse groove at its end connecting the central longitudinal hole with the I external groove, said longitudinal groove V.being covered by said shell, said longitudinal v hole beingl adapted to receive the two conductor wires which are attached to the and is electrically connected to said shell at 10 plug, one of which wires enters said hole, its outer end.

extends through said body, passes through In testimony whereof I ax my signature said aperture in said disk and is electrically in presence of two witnesses.

connected thereto and the other of which wires enters said hole, extends first through ROBESON B WOLCOTT' said body, then radially outward throughr Witnesses:

the transverse groove and then backward BETTY H. SANGER, through said external longitudinal groove ALFRED C. NELSON. 

